python和js的async

main.js

sleep = (ms)=> new Promise(resolve => setTimeout(resolve, ms))
function bsleep(millis){
  var date = new Date()
  var curDate = null
  do {curDate = new Date()}
  while(curDate-date < millis)
}
print = console.log

foo = async (i)=>{
  print("开始做点io")
  await sleep(1000)
  print("嗯，io处理完了")
  return i
}

(async()=>{
  a = foo(1)
  b = foo(2)
  c = Promise.all([a,b])
  print("假装开始计算")
  bsleep(1000)
  print("假装就这么算完了")
  print("io结果是",await c)

})().then(()=>process.exit())

main.py

import asyncio
import time

loop = asyncio.get_event_loop()

async def foo(i):
    print("开始io操作")
    await asyncio.sleep(1)
    print("结束io操作")
    return i

async def main():
    a = foo(1)
    b = foo(2)
    c = asyncio.gather(a,b)
    print("开始计算点东西")
    time.sleep(1)
    print("恩，算完了")
    print("io结果是",await c)

loop.run_until_complete(main())